The Best Cornstarch Substitutes for Thickening & Baking

Editorial note: This is a practical substitution guide, not a FoxyChef laboratory test. Earlier claims about test batches, sensory panels and a numerical reliability score have been removed because this article did not provide supporting records.

Choose a substitute for the dish

If you are thickening a gravy or a hearty soup, all-purpose flour is a useful pantry option. A common starting point is two tablespoons of flour for each tablespoon of cornstarch. That is a starting quantity for thickening, not a universal replacement rule for every recipe. For a clear sauce, a fruit filling or a crisp coating, consider the particular starch and preparation method instead of applying the same conversion automatically.

First check what the cornstarch is doing. Is it thickening liquid, coating pieces of food, or forming part of a baking mixture? Then decide what matters most: a clear finish, a creamy texture, a crisp surface or the balance of a tested recipe. A substitution can be useful while still changing the result. The table above is an overview; the notes below explain how to approach that decision.

All-purpose flour for gravy and soup

Flour is a convenient choice when a slightly opaque sauce is acceptable. Measure the flour rather than adding an unmeasured handful. Mix it smoothly into a little cool liquid before introducing it to the hot dish, or follow a recipe that cooks flour with fat to make a roux. These are different preparation methods, so follow the sequence intended for your sauce rather than combining instructions from both.

Add the mixture gradually while stirring, then allow the sauce to cook and assess the texture before adding more. The result should be judged after the flour has had time to cook, not at the instant it enters the pan. If a recipe gives a cooking time for its roux or sauce, retain that instruction. Flour contains wheat and is not an appropriate substitute when a gluten-free result is required.

Potato starch and arrowroot

Potato starch and arrowroot are alternatives worth considering when flour would change the appearance or ingredients of the dish too much. Check that your package contains the starch named in the recipe. Potato flour and potato starch are not interchangeable labels. A blend sold for gluten-free baking may also contain several ingredients, so it should not be treated as pure starch.

The one-to-one amounts in the overview are initial comparison points, not guarantees for every brand and cooking method. Look for instructions on the package or a recipe that uses your chosen starch in the same kind of dish. Pay attention to when the starch is added and whether the recipe calls for further simmering. If the only available guidance concerns a different use, test a small portion before changing the entire pan.

Tapioca: check the form before measuring

Tapioca starch, quick-cooking tapioca and tapioca pearls are different products. A quantity written for one form should not be transferred to another without appropriate recipe guidance. For a fruit filling, choose a recipe or thickener chart that names both the fruit and the tapioca product. Do not assume a conversion for sauce will produce the same result inside pastry.

King Arthur Baking’s pie thickener guide explains that the amount needed depends on the fruit and thickener. It also distinguishes flour from higher-starch alternatives and describes the texture contributed by quick-cooking tapioca. Use that chart for its stated pie applications. It does not establish a universal ratio for all soups, coatings and baked goods.

For baking and crisp coatings

A cake, biscuit or cookie may use cornstarch for a different purpose from a saucepan of gravy. Replacing a small amount in a flour mixture is a recipe-development decision; a sauce-thickening ratio is not enough evidence. When the outcome matters, use a tested recipe written for the ingredients you have. Keep its quantities and method together rather than borrowing a ratio from an unrelated dish.

The same applies to coatings. Check whether a recipe calls for dry starch, a wet batter or a combination of flour and starch. Replacing the starch can change how the coating handles and cooks. Start with a small batch, observe the coating and follow the dish’s cooking instructions. A successful sauce substitution does not prove that a coating will behave identically.

A practical way to make the swap

1. Read the whole method. Find the step where cornstarch enters the dish and identify its purpose before selecting a replacement.
2. Check your product. Confirm the ingredient name, whether it is a blend, and any relevant allergen statement. Keep the package instructions available.
3. Measure consistently. Use the same type of measuring spoon for both ingredients. Record whether a recipe specifies level measures or a weight.
4. Change one thing. Keep the rest of the recipe the same so you can understand what the substitute changed.
5. Assess before adding more. For a sauce, stir and follow the relevant cooking method before deciding it needs another addition.

What a substitution cannot promise

No single starch swap guarantees identical flavour, clarity, thickness or reheating behaviour across every dish. Avoid describing an alternative as an exact match unless you have tested that recipe under the same conditions. If you plan to repeat a successful substitution, note the product, quantity, cooking method and result. Those notes are more useful than an unsupported universal score.

This page does not provide a shelf-life guarantee. Follow storage guidance for the complete dish and its ingredients. For dietary requirements, check the replacement itself and the rest of the recipe rather than relying on a general label attached to a starch. When serving others, explain the ingredient change so they can make their own choice.

Sources and correction

Reference: King Arthur Baking: Pie Thickener. The source informs the pie-filling discussion; the step-by-step decision checklist is editorial guidance, not a published experiment. Reviewed 6 September 2026. Removed the previous unsupported claims of 25 kitchen tests, sensory-panel percentages and a 9.3/10 reliability rating.